Crowding mechanism



Feb. 21, 1928. a 1,660,142'

v c. G. WAGNER ET AL CROWDING MECHANISM Filed April 15. 1926 2 Sheets-Sheet 1 2 Sheets- Sheet 2 Feb. 21, 1928.

C. GlWAGNER ET AL CROWDING MECHANISM Filed April 15. 1926 Patented Feb. 21, 1928.

UNITED STATES PATENT OFFICE.

CARL G. WAGNER AND JOHN M. KERR,

OF BAY CITY, MICHIGAN, ASSIGNORS TO BAY CITY DREDGE WORKS, A CORPORATION OF MICHIGAN.

onownnve mncnanism.

Application filed; April 15,

' tial and cheap crowding mechanism of simple construction, which is very easy to assemble and operate.

A further object still is, to design a cable crowding mechanism particularly adaptable for excavators on which the main frame or carriage is non-revolving.

With the above and other objects in view, the present invention consists in the combination and arrangement of parts, hereinafter more fully described, illustrated in the accompanying drawings and particularly pointed out in the appended claims, it being understood that changesmay be made in the form, size, proportion and minor details of construction, without departing. from the spirit, or sacrificing any of the advantages of the invention.

In the drawings Fig. 1 is a side elevation'of aboom and excavating shovel illustrating our improved crowding mechanism in position.

Fig. 2 is an enlarged fragmentary side view of the boom and crowding mechanism.

Fig. 3 is a top plan view thereof.

Fig. 4 is a-transverse sectional view taken on the line 4.-& of Fig. '3.

Referring now particularly to the drawings in which we have shown the preferred embodiment of our invention, the numeral 5 indicates the boom which can be of any suitable construction, and which is held in any desired 'position'of inclination by means of a' cable 6 secured to a mast 7 in the usual manner. The inner end of the boom is pivotally secured to the excavating machine (not shown). at the point 8, and is swung by means of a suitable turntable or circle 9 provided on the machine. Spaced apart fabricated members 10 comprise the boom proper,

and a double stick dipper handle 11 is 1926. Serial No. 102,132.

mounted for travel therebetween. a conventional dipper 12 being secured to the lower end thereof in the usual manner, and toothed racks 13 are secured to oneside of each stick as shown, an angle 1A being fixed to the stick adjacent the upper end of the rack and forms a stop to limit the downward travel of the dipper handle.

The crowding mechanism is mounted on the boom 5'and 'comprlses a transversely disposed shaft 15 journaled in suitable bearings 16 mounted on the boom members. A reduc-- ,tion drum A is loosely mounted on this shaft 15 and is formed as clearly shown in Fig. ,4 of the drawings, the drum' 17 being of larger diameter than the drum 18 and preferably formed integral therewith, the end of the drum 17 being dished as shown at 19 and forming one part of a friction clutch, the surface of said clutch being'preferably suitably lined to secure proper frictional contact. crowding drum B is keyed on the shaft 15 directly adjacentthe reduction drum, the end 20 .forming the male half of the friction clutch, and a cable 21 is anchored to-and wound on said drum (not shown) and which is mounted on the excavator frame.

A spur p1n1on 22 18 mounted on one-end of A second auxiliary reverse the shaft 15, said pinion meshing with a gear 23 which is secured on a transversely disposed shaft 24 directly adjacent the shaft 15, and which is journaled in suitable bearings 25 mounted on the boom.

Spaced apart spur pinions 26 and 26 are mounted on the shipper shaft 24 and saddles 27 and 27 embrace the pinions and loosely engage the shaft, the sticks 11 which form the dipper handle, extending therethrough, and the racks engage the pinions, so that, when the pinions are rotated, the dipper stick will be raised or lowered accordingly.

A hoist cable 28 is anchored to and wound .on the drum 18, thence leading to and being secured to the dipper 29, a second cable 30 being anchored to and wound on the drum 17, thence leading to the hoist drum (not shown) on the machine, and it will be obvious that as the hoisting drum is rotated, the reduction drum will be actuated, the cable 28 will be wound on the drum 18, and the dipper raised accordingly, a brake (not shown) being provided on the hoisting drum on the machine for holding the dipper in shifting the reduction drum transversely on by winding any posit-ion, release of the hoist drum allows the dipper to drop by gravity, preparatory to being forced into the work.

Eccentric clutch levers 31 and 31 are loosely mounted on the shipper shaft, the lever 31 being secured to a bracket 32 which is bolted to the boom frame, said bracket being provided with spaced apart openings therein so that the lever may be set as desired, a reach rod 33 is connected to the end of the opposite lever 31, and is pivotally connected toa foot pedal on the machine, a collar 34 being interposed between the bearings and the eccentric clutch lever, and when it is desired to shift the'friction clutch into engagement, the footlever is actuated, which in turn actuates the clutch lever 31, thereby the shaft, and the friction clutch into engagement this drives the gears to shift the dipper into the work simultaneously as the cable is wound on the drum 18 to hoist the bucket, release being effected by, releasing the foot lever, and the coiled spring 35, which is interposed between the drums A and B.

The relative diameters of the drums 17 and 18 provide a substantial reduction, and thisdratio can be increased or reduced as desire In the construction shown when the hoist drum is released the dipper is lowered by gravity to the desired digging osition, from where it may be hoisted and crowded as above described. For bringing the dipper back to load close to front of machine, the momentum or swing established in lowering the bucket is utllized, also the rotation of the reversecrowding drum B, caused cable 21 on separate drum Snot shown on machine, is used to raise the ipper to clear the ground in the backward d1 swing, and when bucket has reached limit of its backward swing it is dropped to the work, further, it is ofttimes necessary to shift the position of the dipper when loaded, as when dumping into vehicles of various kinds, and this can be quickly done with the reverse crowding drum as above described. ,A suitable trip is rovided on the bucket for dumping the load whenin proper posi-- tion, a trip line 36 leading up and to the operator on the machine.

From the foregoing description it will be obvious that we have perfected a substantial and effective dipper crowding mechanism, by means of crowded into the work the hoisting thereof.-

What we claim is 2-- 1, The combination with a boom, of a.

which the dipper can be' simultaneously withv reduction ing shaped to form a friction clutch, a.

shipper shaft spaced from the transversely disposed shaft and geared thereto, a di per handle, and pinions on said shipper s aft 7 transversely disposed shaft journaled thereon, a reduction drum mounted on said shaft, an auxiliary drum adjacent thereto, the ends of said drums being shaped to form a clutch, a shipper shaft. spaced from the transversely disposed shaft and geared thereto, a dipper handle, gears on the said shipper shaft adapted to engage said dilpper handle, and means on the transversely isposed shaft for shlfting said drums into driving engagement with each other.

3. The combination with, a boom, a transversely disposed shaft journaled thereon, a reduction drum mounted on the shaft, an auxiliary drum adjacent thereto, the ends of said drum being shaped to form a clutch, a shipper shaft spaced from the transversely disposed shaft and driven therefrom, a double stick dipper handle, racks secured thereto, gears mounted on the shipper shaft and meshing with said racks, and saddles mounted on the shipper shaft and embracing said sticks to hold them in proper position.

4. The combination with a boom, a transversely disposed shaft journaled thereon, a reduction drum loosely mounted on the shaft, an auxiliary drum adjacent thereto,

form a clutch, a shipper shaft ournaled on the boom adjacent the transversely disposed shaft, gears connecting said shafts, a double I stick dipper handle, racks secured thereto,

pinions on' the shipper shaft and meshing with said racks, saddles mounted on the shipper shaft and embracing the dipper hane, and means for shifting said reduction drum into frictional engagement with the auxiliary drum,

- 5. The combination with a boom, a transversely disposed shaft journaled thereon, a reduction drumrotatably mounted on the shaft, an auxiliary drum ad'acent thereto,

one end of each drum. being s aped to form a frictionv clutch, a shipper shaft 'ournaled on the boom and spaced from t e transversely disposed shaft, gears connecting saidshafts, a dipper stick, racks secured thereto, pinions on the shipper shaft and engaging said racks, saddles pivotally mounted on the shipper shaft and embracing the sticks, i

and means for shifting the drum into frictional engagement for simultaneously driving the reduction drum and actuating-said 6. The combination with a boom, a trans versely disposed shaft journaled thereon, a

dipper sticks.

shaft, an auxiliary drum adjacent thereto, the ends of said drum being shaped 'to form drum rotatably 'mounted on said 1,eeo,142 a a friction clutch, a shipper shaft mounted bracing said sticks, means for forci the V on the boom and spaced from the transdrums into enga ment to form a clutc and versely disposed shaft, ears connecting said resilient means or releasing said clutch. i0 shaft, 3. double stick ipper handle, racks In testimony whereof we afli; our signa 5 secured thereto, pinions on the ship er shaft tures. Y

and engagin sald racks, and sadd es pivot- CARL G.- WAGNER.

ally mounted on the shipper shaft and em- JOHN M. KERR. 

